First thread.
I've been using a pair of Orange crush 20L's for pad sessions. Few weeks ago one of them started to fail. The power led remains lit. But no sound is coming from the speaker. Cranking the gain to 100% restarts the system and the guitarr can be heard again. This keeps happening.
So I did some digging. Swapped the gain pot thinking maybe the contacts loose. While the amp was opened up on my table I tried to play. The problem still persisted. Finally I found that touching a screwdriver to the left leg of the poweramp ic restarts the system. I was suggested to solder a paf-471 to the iC leg and ground it. I just bought the PAf.
Just leaving this here to get a second opinion before I solder something not specified by the manufacturer design. If any other solution is applicable or, if my diagnosis means something else I'd like to know.
TIA.
I've been using a pair of Orange crush 20L's for pad sessions. Few weeks ago one of them started to fail. The power led remains lit. But no sound is coming from the speaker. Cranking the gain to 100% restarts the system and the guitarr can be heard again. This keeps happening.
So I did some digging. Swapped the gain pot thinking maybe the contacts loose. While the amp was opened up on my table I tried to play. The problem still persisted. Finally I found that touching a screwdriver to the left leg of the poweramp ic restarts the system. I was suggested to solder a paf-471 to the iC leg and ground it. I just bought the PAf.
Just leaving this here to get a second opinion before I solder something not specified by the manufacturer design. If any other solution is applicable or, if my diagnosis means something else I'd like to know.
TIA.
Just try resoldering that leg. Probably a dry joint where touching it moves it enough to make contact again.
Did as you guys suggested. Didn't really help doing the solder job again. The problem is still present. Any other suggestions guys?
TIA
TIA
Anything? Anyone? I've got a wasted Crush 20L on the floor just rooting away while I have to use My desktop sound system
Check the voltage on pins 1, 2 and 4 of the TDA2050. All should be at 0v.
Pin 5 at +24 and Pin 3 at -24.
There is a FET supplying the volume pot, it mutes the circuit and there is a 10M resistor R45 that should have enough voltage on it to turn the FET on. They are prone to going open circuit. Touching that will switch the FET on and restore your signal path.
Look and follow the schematic with your DVM.
Pin 5 at +24 and Pin 3 at -24.
There is a FET supplying the volume pot, it mutes the circuit and there is a 10M resistor R45 that should have enough voltage on it to turn the FET on. They are prone to going open circuit. Touching that will switch the FET on and restore your signal path.
Look and follow the schematic with your DVM.
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